docs: def add_view(self, request, form_url='', extra_context=None):
          """The ``add`` admin view for the :class:`Page <pages.models.Page>`."""
          extra_context = {
              'language': get_language_from_request(request),
              'page_languages': settings.PAGE_LANGUAGES,
          }
          return super(PageAdmin, self).add_view(request, form_url,
                                                 extra_context)